C# 语法 - Lambda 表达式示例 - ForEach() over Generic List [英] C# Syntax - Example of a Lambda Expression - ForEach() over Generic List

问题描述

首先，我知道框架中已有的通用 List<> 类的方法会迭代 List<>.

First, I know there are methods off of the generic List<> class already in the framework do iterate over the List<>.

但举个例子，编写 ForEach 方法来迭代 List<> 的每个对象并执行 Console.WriteLine(object.ToString) 的正确语法是什么?()) 在每个对象上.将 List<> 作为第一个参数，将 lambda 表达式作为第二个参数的东西.

But as an example, what is the correct syntax to write a ForEach method to iterate over each object of a List<>, and do a Console.WriteLine(object.ToString()) on each object. Something that takes the List<> as the first argument and the lambda expression as the second argument.

我见过的大多数示例都是作为扩展方法完成的或涉及 LINQ.我正在寻找一个普通的方法示例.

Most of the examples I have seen are done as extension methods or involve LINQ. I'm looking for a plain-old method example.

推荐答案

public void Each<T>(IEnumerable<T> items, Action<T> action)
{
    foreach (var item in items)
        action(item);
}

...并这样称呼它:

Each(myList, i => Console.WriteLine(i));

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